I agree with Beef-boy. The Brettonian Standard Bearer would be much better if you dry-brushed his uniform with Skull White along the edges.
As for the Ork, use more colours.
When I paint Orks, Goblins, Hobgoblins and so on, I first use Goblin Green as the subcolour, then I ink the entire thing. From then on I use up to 6-7 layers of green - from the darkest black-green to a light yellow-green paint, just to get the skin correct. After that, it is time to paint the rest of the model.
Most of my colours are self-made.
My best advice to you would be to learn the dry-brushing technique, and to mix your own paint.
I'll take some pictures of some of my models when I get back to Norway.
From what I can see from your models, you have a lot of skill already.
Keep it up
k: